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| Home > Publications database > Untersuchungen zur Radkoniklidfreisetzung durch Einwirkung konzentrierter Salzlaugen auf Alu-MTR-Brennelementen: Abschlussbericht |
| Book/Report | FZJ-2019-04536 |
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1998
Forschungszentrum Jülich, Zentralbibliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/22634
Report No.: Juel-3594
Abstract: The discussion of a national fuel management concept for research reactor fuel elements is the reason for the R&D project concerning safe direct disposal of spent MTR fuel elements. Especially the behaviour of the MTR fuel elements in corrosive aqueous phases is relevant for the long term safety concept. lt is expected that the MTR fuel element behaviour differs from the LWR fuel elements due to their different matrix characteristics. The experimental objectives of this project are related to the corrosion behaviour of the cladding and matrix material aluminium, the radionuclide release from spent MTR fuel element pieces into salt brines and the immobilisation of dissolved radionuclides in the near field of the repository. The experimental results show, that the aluminium disintegrates in salt brines within few years and even within few months in the presence of Bast iron. Therefor the aluminium has no barrier function. The fast corrosion produces new solid phases, which are able to immobilise most of the dissolved radionuclides. Sorption experiments with possible corrosion products confirm the ability of such matrices to sorb radionuclides, especially the long living actinides. The determination of the long time stability of such phases is one task for future projects. However most of the experiments had been made under aerobic conditions, hence the obtained results have to be verified under anaerobic conditions. First experiments with granite water show, that the cladding may have a life time of several hundred years in this aqueous phases.
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